Turkey designates East Turkistan Islamic Party also known as the East Turkistan Islamic Movement as a terrorist organisation. China and Turkey agree w/ each other that anti-terror cooperation and common security are in their core interest. China expressed its appreciation & support of Turkey's decision to list the group as a terror org. The ETIP is active in both Syria and Afghanistan.

Central Asia is the core region of the Asian continent and stretches from the Caspian Sea in the west to China in the east and from Afghanistan in the south to Russia in the north. It is also sometimes referred to as Middle Asia, and, colloquially, "the 'stans" (as the six countries generally considered to be within the region all have names ending with the Persian suffix "-stan", meaning "land of") and is within the scope of the wider Eurasian continent.
Central Asia include five republics of the former Soviet Union: Kazakhstan (pop. 17 million), Kyrgyzstan (5.7 million), Tajikistan (8.0 million), Turkmenistan (5.2 million), and Uzbekistan (30 million), for a total population of about 66 million as of 2013–2014. Afghanistan (pop. 31.1 million) is also sometimes included. (wikipedia)